The photograph
to the left shows a typical air cooler manufactured from aluminium finned
carbon steel tubes and comprising eight sections of extended surface tubes
welded into fabricated steel headers.

The casing
design is airtight and stiffened to withstand a negative pressure of 600mm
wg.

This particular
heat exchanger was designed to reduce the temperature of 13,585 cubic metres
per hour air at 180 deg C to 35 deg C when supplied with 985 litres per
minute cooling water flowing at 20 deg C returning at 26 deg C. (Heat Transfer
430 KW)

Heap Dawson
Limited provide a comprehensive technical advice and design service for
all its range of products including extended surface and plain tube heat
exchangers.

SHELL AND TUBE HEAT EXCHANGERS

The photograph
to the right shows a fixed tubeplate shell and tube heat exchanger manufactured
having a grade 316L stainless steel tube bundle and domed header boxes
with carbon steel outer shell. The unit shown was designed to raise the
temperature of 53 litres per minute water from 5 deg C to 85 deg C when
supplied with 502 Kg per hour dry saturated steam at 75 Psi gauge pressure.
( Heat Transfer 291 kW)

The heat
exchanger was manufactured as a four pass unit, (water tube side), and
arranged for simple skid mounting.

Heap Dawson
Limited specialise in the design and manufacture of a large range of industrial
heat exchangers and provide a comprehensive technical advice and design
service for all its range of products.

BOILER
ECONOMISERS AND HEAT RECOVERY SYSTEMS

Our subsidiary
company Heap Economiser Limited specialise in the design of heat recovery
systems and heat exchangers designed specifically to heat pressurised
boiler feedwater by means of the exit flue gas when firing on Natural
Gas.

The heat
exchanger or economiser is installed in the boiler exit flue gas stream
and comprises sections of extended surface tubes through which the pressurised
feedwater is passed, after the pump in a contra-flow arrangement.

With dual
fuel fired boilers and when firing on oil then the flue gases must be
diverted away from the heat exchanger to avoid fouling and rapid corrosion.
Economisers can be supplied complete with transformation sections and
include integral by-pass and damper assemblies to suit individual site
installations.

Where the
boiler is fired on gas only then heat exchangers can be installed directly
into the exit flue gas ductwork without the need to incorporate by-pass.

All our heat exchangers are manufactured to the highest quality in accordance
with the latest British Standards and meeting the requirements of Insurance
Companies and Third Party Inspection Authorities. Economisers are hydraulically
tested at our works to a minimum 37.5 Bar (g) and test certificates issued
accordingly.

Our range
of economisers is completely flexible for duty, size and configuration;
each unit is designed and built for its individual application.